Hello everyone,
I’d like to briefly introduce our house project here. The goal is to exchange ideas with you on various topics and possibly create specific threads for detailed subtopics. Since we haven’t signed any contract yet and only have two initial rough quotes, I can’t provide details like heating load calculations at this stage. Thanks for your understanding.
Now for the first rough plan:
- Single-family house with about 170-180m² (1830-1940 sq ft) living space
- Bungalow
- Only the ground floor will be occupied
- Geothermal heating with 2 boreholes, each 80m (260 ft) deep, and a Nibe S1255 unit
- Floor slab insulation with glass gravel
- 36.5cm (14 inches) exterior walls made of Ytong masonry units
- Ceiling insulation using Ytong ceiling elements (maybe too expensive!?)
- Household of 2 people (likely to increase to 4)
- Decentralized ventilation (I’m not very satisfied with ReglerAir window units)
- Photovoltaic system on the roof, 7-10 kWp, without battery storage
- Triple-glazed PVC windows
I would appreciate your initial assessment and feedback.
Budget: Moderate, two incomes; total costs for the complete house (excluding furniture and kitchen) should not exceed 400,000 euros.
I will provide more information later.
Best regards and thanks for your feedback!
Peter
I’d like to briefly introduce our house project here. The goal is to exchange ideas with you on various topics and possibly create specific threads for detailed subtopics. Since we haven’t signed any contract yet and only have two initial rough quotes, I can’t provide details like heating load calculations at this stage. Thanks for your understanding.
Now for the first rough plan:
- Single-family house with about 170-180m² (1830-1940 sq ft) living space
- Bungalow
- Only the ground floor will be occupied
- Geothermal heating with 2 boreholes, each 80m (260 ft) deep, and a Nibe S1255 unit
- Floor slab insulation with glass gravel
- 36.5cm (14 inches) exterior walls made of Ytong masonry units
- Ceiling insulation using Ytong ceiling elements (maybe too expensive!?)
- Household of 2 people (likely to increase to 4)
- Decentralized ventilation (I’m not very satisfied with ReglerAir window units)
- Photovoltaic system on the roof, 7-10 kWp, without battery storage
- Triple-glazed PVC windows
I would appreciate your initial assessment and feedback.
Budget: Moderate, two incomes; total costs for the complete house (excluding furniture and kitchen) should not exceed 400,000 euros.
I will provide more information later.
Best regards and thanks for your feedback!
Peter
boxandroof schrieb:
KfW55 is already quite good, especially with the new subsidies. I would only opt for better if it happens to be possible and only slightly more expensive.
Mechanical ventilation with heat recovery is better to be centralized.
Stay flexible in the early planning phase. I don’t think you are strongly attached to Ytong anyway.
Therefore, I wouldn’t fixate too early on the wall system and overall structure but leave it dependent on the supplier. You can still question details there and make adjustments if something doesn’t suit you.What would you prefer regarding the walls? Ytong was recommended to me by some friends and family.
Centralized mechanical ventilation with heat recovery concerns me because of the costs...
PeterS90 schrieb:
Ytong was recommended to me by some friends and family.For an affordable house according to the energy saving regulation or, if you prefer, KfW-70 standards. Sure, no problem. Upgrading to KfW-40 requires so many complicated adjustments that you end up paying twice for the cost savings. Choose wood frame construction or sand-lime brick with external thermal insulation composite system (ETICS).Wood fiber boards instead of polystyrene in ETICS are becoming increasingly popular, not significantly more expensive, and if the plasterer works carefully, they remain durable for decades and are much easier to dispose of afterward.
Scout schrieb:
For an affordable house meeting the Energy Saving Ordinance or, if you prefer, KfW-70 standards, sure. Upgrading it to KfW-40 requires so many complicated adjustments behind the scenes that you end up paying twice the cost advantage. Use timber frame or sand-lime brick with external thermal insulation composite systems (ETICS).
Wood fiber boards instead of polystyrene in the ETICS are becoming increasingly popular, not much more expensive, and if the plasterer works carefully, they last for decades and are easy to dispose of afterwards.Interesting alternatives, I will look into them further. To summarize: With Ytong, I can probably reach a maximum of KfW 55 standard; achieving higher is extremely difficult. For below KfW 55, timber frame or sand-lime brick combined with separate insulation is recommended.
What about ventilation? Are there advocates here for decentralized systems? I assume the better the KfW standard, the more I will need to invest in ventilation.
B
boxandroof26 Jan 2020 00:37PeterS90 schrieb:
What would you prefer regarding the walls? Ytong was recommended to me by some friends and family. I would stay open-minded at first and listen to what is offered and why, in order to meet the KfW standard at certain costs. It doesn’t make sense to choose a specific type of block upfront if the preferred contractor doesn’t use it. The same goes for the foundation slab, etc.—get some quotes first, then you can ask further questions.
A monolithic structure with good insulation is probably more expensive and more complicated. The material of the exterior walls tends to be overrated. If special soundproofing isn’t required, it doesn’t really matter. There are more important things to plan in the house. Forgetting a crucial electrical outlet can potentially have a bigger impact.
I took what my architect recommended and what is common here: Ytong, mineral wool insulation, and facing bricks. Today I might choose sand-lime brick, but in daily life it wouldn’t make any difference to me.
Ventilation is a comfort feature and adds cost. A decentralized system in a single-family home is a compromise I wouldn’t make: noise, holes in the walls, exterior appearance, a dozen units, and potential points of failure... Look up the pros and cons of decentralized versus centralized ventilation and decide for yourself.
I wouldn’t install anything just because of a one-time subsidy if I wouldn’t be convinced of it otherwise.
B
boxandroof26 Jan 2020 00:45PeterS90 schrieb:
Ceiling insulation using Ytong ceiling (maybe too expensive!?)What do you expect to achieve with that?boxandroof schrieb:
What do you expect from this?I assumed this would be better for KfW40 because the specification in Offer 1 included a precast concrete slab, while Offer 2 planned a wooden ceiling with insulation wool. That seemed insufficient in terms of insulation to me. Maybe it's enough for KfW55?I really like the central ventilation system by Zender based on the videos I found on YouTube.
By the way, both companies want to build with 36.5cm (14 inches) Ytong blocks. So far, they have only planned everything according to the Energy Saving Ordinance and not according to KfW standards. I will bring this up with them.
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